Due to COVID-19 pandemic, 2021 Asia Environment and Resource Engineering Conference (AERE 2021) was held as online conference during November 19-21, 2021.On behalf of the organizing committee, we'd like to thank all the keynote speakers, for your interesting and inspiring speeches, and all the authors, who have contribuited your paper to the conference, and your excellent presentations. We hope to see you all next year. Peer reviewed papers and presented papers have been published into International Journal of Environmental Science and Development (ISSN: 2010-0264 (Print); 2972-3698 (Online)):https://www.ijesd.org/list-175-1.html